improvement vs scar

improvement

noun
  • Increase; growth; progress; advance. 

  • The act of improving; advancement or growth; a bettering 

  • Something which is improved 

  • Valuable additions or betterments, for example buildings, clearings, drains, fences, etc., on premises. 

  • A useful addition to, or modification of, a machine, manufacture, or composition. 

  • The state of being improved; betterment; advance 

  • The act of making profitable use or application of anything, or the state of being profitably employed; practical application, for example of a doctrine, principle, or theory, stated in a discourse. 

scar

noun
  • A rock in the sea breaking out from the surface of the water. 

  • A permanent mark on the skin, sometimes caused by the healing of a wound. 

  • A cliff or rock outcrop. 

  • A bare rocky place on the side of a hill or mountain. 

  • A permanent negative effect on someone's mind, caused by a traumatic experience. 

  • Any permanent mark resulting from damage. 

  • A marine food fish, the scarus or parrotfish (family Scaridae). 

verb
  • To mark the skin permanently. 

  • To form a scar. 

  • To affect deeply in a traumatic manner. 

How often have the words improvement and scar occurred in a corpus of books? (source: Google Ngram Viewer )